JPH0732099A - Method for controlling discharging flow in continuous caster - Google Patents
Method for controlling discharging flow in continuous casterInfo
- Publication number
- JPH0732099A JPH0732099A JP20266793A JP20266793A JPH0732099A JP H0732099 A JPH0732099 A JP H0732099A JP 20266793 A JP20266793 A JP 20266793A JP 20266793 A JP20266793 A JP 20266793A JP H0732099 A JPH0732099 A JP H0732099A
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- Prior art keywords
- mold
- molten steel
- continuous casting
- width
- electromagnetic brake
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、鋼の連続鋳造におい
て、気泡や介在物に起因する鋳片欠陥を、浸漬ノズルか
らの溶鋼吐出流の制御によって効果的に低減するための
連続鋳造機の吐出流制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting machine for continuously reducing the slab defects caused by bubbles and inclusions in continuous casting of steel by controlling the flow of molten steel discharged from the immersion nozzle. The present invention relates to a discharge flow control method.
【０００２】[0002]
【従来の技術】連続鋳造中に鋳片の表皮下に捕捉される
気泡は、浸漬ノズルのノズル閉塞対策のために吹き込ん
だ不活性ガスや、鋼中酸素量が比較的高い鋼種を鋳込む
際溶鋼の凝固に伴って排出される酸素が起因となって生
成されるものである。また、連続鋳造中に鋳片の表皮下
に捕捉される介在物は、溶鋼中に含まれるアルミナであ
る。このような気泡や介在物、もしくは気泡と介在物が
凝集したものを含んだ鋳片は、後工程でコイルに圧延す
るとフクレ疵のような欠陥となる。また、図４（ａ）
（ｂ）に示すとおり、鋳型１１幅に関係なく１本の浸漬
ノズル１２から溶鋼１３を吐出させ、メニスカス１４上
にパウダー１５を供給して連続鋳造すると、図５に示す
とおり、鋳型幅の増大に伴って吐出流量が大幅に多くな
り、図６に示すとおり、フクレ疵は、鋳型幅の増加に伴
って発生し易くなる。2. Description of the Related Art Bubbles trapped under the epidermis of a slab during continuous casting are used when casting an inert gas blown in as a measure to prevent nozzle clogging of an immersion nozzle or a steel grade with a relatively high oxygen content in steel. It is generated due to the oxygen discharged as the molten steel solidifies. The inclusions trapped under the epidermis of the slab during continuous casting are alumina contained in the molten steel. A slab containing such bubbles or inclusions, or aggregates of bubbles and inclusions becomes defects such as blistering flaws when rolled into a coil in a later step. In addition, FIG.
As shown in (b), regardless of the width of the mold 11, the molten steel 13 is discharged from one dipping nozzle 12 and the powder 15 is supplied onto the meniscus 14 to continuously perform casting, and as shown in FIG. As a result, the discharge flow rate increases significantly, and as shown in FIG. 6, blistering flaws are more likely to occur as the mold width increases.
【０００３】従来、上記のような欠陥を解消させる方法
としては、浸漬ノズルからの溶鋼吐出流の流速や方向を
調整すべく、該ノズルの吐出孔形状の工夫や、電磁ブレ
ーキを適用して浸漬ノズルからの溶鋼吐出流を制御する
方法（特開昭５７−１７３５６号公報）が提案されてい
る。しかしながら、上記方法では、鋳造用鋳型幅の増大
に伴う鋳型内での気泡もしくは介在物の肥大凝集の増加
を低下させることは不可能であり、鋳片内質欠陥に対す
る有効な対策とはなり得なかった。[0003] Conventionally, as a method of eliminating the above-mentioned defects, in order to adjust the flow velocity and the direction of the molten steel discharge flow from the immersion nozzle, the shape of the discharge hole of the nozzle is devised and the electromagnetic brake is applied to the immersion nozzle. A method of controlling the flow of molten steel discharged from a nozzle (JP-A-57-17356) has been proposed. However, in the above method, it is not possible to reduce the increase in the agglomeration of air bubbles or inclusions in the mold with the increase in the casting mold width, and it may be an effective measure against the slab internal defects. There wasn't.
【０００４】また、他の方法としては、一対の短辺壁と
一対の長辺壁とよりなる連続鋳造用鋳型の長辺壁の壁面
下方部に連続鋳造用浸漬ノズルからの吐出流を減速する
ための電磁ブレーキを配設し、該長辺壁の上方部には連
続鋳造用鋳型に供給した溶鋼に水平流動を生じさせる電
磁撹拌装置を配設した連続鋳造用浸漬ノズルの吐出流制
御装置（特開昭６３−１１９９５９号公報）が提案され
ている。As another method, the discharge flow from the continuous casting immersion nozzle is decelerated below the wall surface of the long side wall of the continuous casting mold comprising a pair of short side walls and a pair of long side walls. A discharge flow control device for a continuous casting immersion nozzle, in which an electromagnetic brake is provided and an electromagnetic stirrer is provided above the long side wall to generate horizontal flow in the molten steel supplied to the continuous casting mold ( JP-A-63-119959) has been proposed.
【０００５】[0005]
【発明が解決しようとする課題】上記特開昭６３−１１
９９５９号公報に開示の装置は、電磁ブレーキにより浸
漬ノズルからの溶鋼の流速を完全に減速すると共に、電
磁撹拌装置により鋳型上方の溶鋼に水平流動を生じさせ
ることにより、気泡や介在物に起因するフクレ疵を防止
するもので、鋳造用鋳型幅の増大に伴う鋳型内での気泡
もしくは介在物の肥大凝集の増加を十分に低下させるこ
とは困難である。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The apparatus disclosed in Japanese Patent No. 9959 is caused by bubbles and inclusions by completely decelerating the flow rate of molten steel from the immersion nozzle by an electromagnetic brake and causing horizontal flow in the molten steel above the mold by an electromagnetic stirring device. This is to prevent blistering flaws, and it is difficult to sufficiently reduce the increase in the agglomeration of air bubbles or inclusions in the mold as the width of the casting mold is increased.
【０００６】この発明の目的は、鋳造用鋳型幅の増大に
伴う鋳型内での気泡もしくは介在物の肥大凝集の増加を
十分に低下できる連続鋳造機の吐出流制御方法を提供す
ることにある。It is an object of the present invention to provide a discharge flow control method for a continuous casting machine, which can sufficiently reduce the increase in the agglomeration of bubbles or inclusions in the mold as the width of the casting mold increases.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記目的
を達成すべく鋭意試験研究を重ねた。その結果、鋳型の
幅方向中央に電磁ブレーキを縦型に配設し、該電磁ブレ
ーキにより溶鋼流減速壁を形成させれば、鋳型幅が見掛
け状半分となること、その各半分の鋳型に対して浸漬ノ
ズル１本づつを使って連続鋳造することによって、鋳造
用鋳型幅の増大に伴う鋳型内での気泡もしくは介在物の
肥大凝集の増加を防止できることを究明し、この発明に
到達した。[Means for Solving the Problems] The inventors of the present invention have made extensive studies to achieve the above object. As a result, by arranging an electromagnetic brake vertically in the widthwise center of the mold, and forming a molten steel flow deceleration wall by the electromagnetic brake, the mold width becomes an apparent half, for each half mold. It was found that continuous casting using individual immersion nozzles can prevent an increase in the agglomeration of bubbles or inclusions in the mold due to an increase in the width of the casting mold, and arrived at the present invention.
【０００８】すなわちこの発明は、連続鋳造機の鋳型に
電磁ブレーキを配設し、浸漬ノズルからの溶鋼吐出流を
減速させる連続鋳造機の吐出流制御方法において、鋳型
幅が１３００ｍｍ以上の場合、鋳型一つに対して浸漬ノ
ズル２本を使用し、鋳型の幅方向中央に電磁ブレーキを
垂直に配設し、該電磁ブレーキにより鋳型の幅方向中央
に溶鋼流減速壁を垂直に形成させ、溶鋼流減速壁により
区画された各半分の鋳型に対し浸漬ノズル１本づつを使
って連続鋳造することを特徴とする連続鋳造機の吐出流
制御方法である。That is, the present invention relates to a discharge flow control method for a continuous casting machine, in which an electromagnetic brake is arranged in the mold of the continuous casting machine to decelerate the molten steel discharge flow from the immersion nozzle. Two dipping nozzles are used for one, and an electromagnetic brake is vertically arranged in the center of the mold in the width direction, and the electromagnetic brake forms a molten steel flow deceleration wall vertically in the center of the mold in the width direction. A discharge flow control method for a continuous casting machine, characterized in that continuous casting is performed by using one dipping nozzle for each half of the molds partitioned by the deceleration wall.
【０００９】[0009]
【作用】この発明においては、鋳型幅が１３００ｍｍ以
上の場合、鋳型一つに対して浸漬ノズル２本を使用し、
鋳型の幅方向中央に電磁ブレーキを垂直に配設し、該電
磁ブレーキにより鋳型の幅方向中央に溶鋼流減速壁を垂
直に形成させ、溶鋼流減速壁により区画された各半分の
鋳型に対し浸漬ノズル１本づつを使って連続鋳造するか
ら、電磁ブレーキにより形成された鋳型の幅方向中央の
溶鋼流減速壁によって、鋳型幅が見掛け状半分となり、
鋳型幅の増大に伴う浸漬ノズルからの溶鋼吐出流の自由
度が減少し、連続鋳造用鋳型内での気泡もしくは介在物
の肥大凝集の増加が抑制され、鋳片の内質欠陥であるフ
クレ疵の発生を防止することができる。In the present invention, when the mold width is 1300 mm or more, two dipping nozzles are used for one mold,
An electromagnetic brake is vertically arranged at the center of the mold in the width direction, a molten steel flow reduction wall is vertically formed at the center of the mold in the width direction by the electromagnetic brake, and the mold is immersed in each half of the mold partitioned by the molten steel flow reduction wall. Since continuous casting is performed using nozzles one by one, the mold width becomes an apparent half due to the molten steel flow deceleration wall formed by the electromagnetic brake in the center of the width direction of the mold.
The degree of freedom of the molten steel discharge flow from the dipping nozzle is reduced with the increase of the mold width, the increase in the agglomeration of bubbles or inclusions in the continuous casting mold is suppressed, and blistering flaws, which are internal defects of the slab, are suppressed. Can be prevented.
【００１０】この発明において連続鋳造機の鋳型幅を１
３００ｍｍ以上としたのは、鋳型幅が１３００ｍｍ未満
では、連続鋳造用鋳型内での気泡もしくは介在物の肥大
凝集の増加が見られず、後工程での冷間圧延後の品質が
悪くならないが、鋳型幅が１３００ｍｍを超えると、冷
間圧延後に疵が発生し、品質が悪化するからである。In the present invention, the mold width of the continuous casting machine is set to 1
300mm or more, the mold width is less than 1300mm, the increase in the agglomeration of bubbles or inclusions in the continuous casting mold is not seen, the quality after cold rolling in the post-process does not deteriorate, This is because if the mold width exceeds 1300 mm, flaws will occur after cold rolling and the quality will deteriorate.
【００１１】[0011]
実施例１ 以下にこの発明方法の詳細を実施の一例を示す図１に基
づいて説明する。図１はこの発明方法を実施する装置の
一例を示す連続鋳造用鋳型の幅方向を示す縦断面図であ
る。図１において、１は連続鋳造機の鋳型、２、３は鋳
型１の幅方向に設けた図示しないタンディッシュの浸漬
ノズル、４は鋳型１内の溶鋼、５は溶鋼４のメニスカ
ス、６は鋳型１の幅方向中央のメニスカス５下１００ｍ
ｍ以下に垂直に配設した電磁ブレーキ、７は溶鋼４のメ
ニスカス５上を覆うパウダー、８は凝固シェルで、浸漬
ノズル２、３から吐出された溶鋼流は、鋳型１の幅方向
中央の垂直に配設した電磁ブレーキ６によって鋳型１の
幅方向中央に垂直な溶鋼流減速壁が形成され、鋳型１幅
の増大に伴う浸漬ノズル２、３からの溶鋼４吐出流の自
由度が減少するよう構成されている。Example 1 Details of the method of the present invention will be described below with reference to FIG. FIG. 1 is a longitudinal sectional view showing the width direction of a continuous casting mold showing an example of an apparatus for carrying out the method of the present invention. In FIG. 1, 1 is a mold of a continuous casting machine, 2 and 3 are immersion nozzles of a tundish (not shown) provided in the width direction of the mold 1, 4 is molten steel in the mold 1, 5 is a meniscus of molten steel 4, 6 is a mold 100m below the meniscus 5 in the widthwise center of 1
An electromagnetic brake vertically arranged below m, 7 is a powder that covers the meniscus 5 of the molten steel 4, 8 is a solidification shell, and the molten steel flow discharged from the dipping nozzles 2 and 3 is perpendicular to the center of the mold 1 in the width direction. The electromagnetic brake 6 disposed in the mold forms a vertical molten steel flow deceleration wall in the center of the mold 1 so that the degree of freedom of the flow of molten steel 4 discharged from the immersion nozzles 2 and 3 decreases as the width of the mold 1 increases. It is configured.
【００１２】上記のとおり構成したことによって、浸漬
ノズル２、３から鋳型１内に吐出された溶鋼流は、鋳型
１幅方向中央に垂直に配設した電磁ブレーキ６によって
鋳型１幅方向中央に垂直の溶鋼流減速壁が形成されるか
ら、鋳型１の幅が見掛け状半分となり、鋳型幅の増大に
伴う浸漬ノズル２、３からの溶鋼４吐出流の自由度が減
少し、溶鋼４内に含まれる気泡や介在物の上昇が促進さ
れ、連続鋳造用鋳型内での気泡もしくは介在物の肥大凝
集の増加が抑制され、鋳片の欠陥であるフクレ疵の発生
を防止することができる。また、浸漬ノズル２、３から
の吐出流量一定の条件下では、従来法に比較して鋳込み
速度を約２倍にすることができ、実操業における生産性
の向上を図ることができる。With the above construction, the molten steel flow discharged from the immersion nozzles 2 and 3 into the mold 1 is perpendicular to the center of the mold 1 in the width direction by the electromagnetic brake 6 disposed vertically in the center of the mold 1 in the width direction. Since the molten steel flow deceleration wall of No. 1 is formed, the width of the mold 1 becomes an apparent half, and the degree of freedom of the discharge flow of the molten steel 4 from the immersion nozzles 2 and 3 decreases with the increase of the mold width. It is possible to promote the rise of bubbles and inclusions that are generated, suppress the increase in the agglomeration of bubbles or inclusions in the continuous casting mold, and prevent the occurrence of blistering flaws, which are defects in the slab. Further, under the condition that the discharge flow rate from the immersion nozzles 2 and 3 is constant, the casting speed can be doubled as compared with the conventional method, and the productivity in actual operation can be improved.
【００１３】実施例２ 実施例１の装置を鋳型幅１８００ｍｍ×２１０ｍｍの湾
曲型連続鋳造機に設置し、鋳型内に溶鋼を供給する浸漬
ノズルはボックス型で、吐出孔の角度を下向き１０°、
浸入深さ２３０ｍｍに設定し、電磁ブレーキはメニスカ
ス下１００〜４００ｍｍで鋳型幅中央に垂直に配設し、
溶鋼吐出流量２．５Ｔｏｎ／ｍｉｎで自動車用鋼板であ
るＴｉ含有極低炭素鋼の連続鋳造を実施した。そして得
られた鋳片を圧延して代表的な欠陥であるフクレ疵の発
生状況を調査した。その結果を従来例と比較して第２図
に示す。また、浸漬ノズルからの吐出流量と介在物およ
び気泡指数との関係を調査した。その結果を図３に示
す。Example 2 The apparatus of Example 1 was installed in a curved type continuous casting machine having a mold width of 1800 mm × 210 mm, the immersion nozzle for supplying molten steel into the mold was a box type, and the discharge hole angle was 10 ° downward.
The penetration depth is set to 230 mm, the electromagnetic brake is 100 to 400 mm below the meniscus, and is vertically arranged in the center of the mold width.
Continuous casting of Ti-containing ultra-low carbon steel, which is a steel sheet for automobiles, was performed at a molten steel discharge flow rate of 2.5 Ton / min. Then, the obtained slab was rolled to investigate the occurrence of blistering flaws, which is a typical defect. The results are shown in FIG. 2 in comparison with the conventional example. Further, the relationship between the discharge flow rate from the immersion nozzle and inclusions and bubble index was investigated. The result is shown in FIG.
【００１４】図２に示すとおり、この発明方法を適用す
ることによって、連続鋳造時における気泡や介在物に起
因する欠陥であるフクレ疵を、従来法に比較して大幅に
低減することができる。また、図３に示すとおり、この
発明方法を適用することによって、連続鋳造時における
気泡や介在物の混入を、従来法に比較して大幅に抑制す
ることができる。As shown in FIG. 2, by applying the method of the present invention, blistering defects, which are defects caused by bubbles and inclusions during continuous casting, can be greatly reduced as compared with the conventional method. Further, as shown in FIG. 3, by applying the method of the present invention, the inclusion of bubbles and inclusions during continuous casting can be significantly suppressed as compared with the conventional method.
【００１５】[0015]
【発明の効果】以上述べたとおり、この発明方法によれ
ば、連続鋳造における鋳型幅増大に伴う気泡や介在物に
起因するフクレ疵を大幅に低減でき、かつ、吐出流量一
定の条件下では、鋳込み速度を約２倍とすることがで
き、生産量の向上を図ることができる。As described above, according to the method of the present invention, blistering flaws caused by bubbles and inclusions associated with the increase in mold width in continuous casting can be significantly reduced, and under a constant discharge flow rate, The casting speed can be doubled, and the production amount can be improved.
【図１】この発明方法を実施する装置の一例を示す連続
鋳造用鋳型の幅方向を示す縦断面図である。FIG. 1 is a vertical cross-sectional view showing the width direction of a continuous casting mold showing an example of an apparatus for carrying out the method of the present invention.
【図２】実施例２における従来法と本発明法のフクレ疵
発生指数を示すグラフである。FIG. 2 is a graph showing blistering flaw occurrence indexes of the conventional method and the method of the present invention in Example 2.
【図３】実施例２における従来法と本発明法の吐出流量
と介在物および気泡指数との関係を示すグラフである。FIG. 3 is a graph showing the relationship between the discharge flow rate and the inclusions and bubble index of the conventional method and the method of the present invention in Example 2.
【図４】従来の鋳込み方法の説明図で、（ａ）図は鋳型
幅が大きい場合、（ｂ）図は鋳型幅が小さい場合の幅方
向断面図である。FIG. 4 is an explanatory view of a conventional casting method, FIG. 4A is a cross-sectional view in the width direction when the mold width is large, and FIG. 4B is a cross-sectional view in the width direction when the mold width is small.
【図５】従来の鋳込み方法での鋳込み速度と吐出流量と
鋳片幅との関係を示すグラフである。FIG. 5 is a graph showing the relationship between the casting speed, the discharge flow rate, and the slab width in the conventional casting method.
【図６】従来の鋳込み方法での鋳片幅とフクレ疵発生指
数との関係を示すグラフである。FIG. 6 is a graph showing the relationship between the slab width and the blistering flaw occurrence index in the conventional casting method.
１、１１ 鋳型 ２、３、１２ 浸漬ノズル ４、１３ 溶鋼 ５、１４ メニスカス ６ 電磁ブレーキ ７、１５ パウダー ８ 凝固シェル 1, 11 Mold 2, 3, 12 Immersion Nozzle 4, 13 Molten Steel 5, 14 Meniscus 6 Electromagnetic Brake 7, 15 Powder 8 Solidification Shell
Claims (1)
し、浸漬ノズルからの溶鋼吐出流を減速させる連続鋳造
機の吐出流制御方法において、鋳型幅が１３００ｍｍ以
上の場合、鋳型一つに対して浸漬ノズル２本を使用し、
鋳型の幅方向中央に電磁ブレーキを垂直に配設し、該電
磁ブレーキにより鋳型の幅方向中央に溶鋼流減速壁を垂
直に形成させ、溶鋼流減速壁により区画された各半分の
鋳型に対し浸漬ノズル１本づつを使って連続鋳造するこ
とを特徴とする連続鋳造機の吐出流制御方法。1. A discharge flow control method for a continuous casting machine, wherein an electromagnetic brake is arranged in the mold of the continuous casting machine to decelerate the molten steel discharge flow from the dipping nozzle. When the mold width is 1300 mm or more, one mold is used. In contrast, using two immersion nozzles,
An electromagnetic brake is vertically arranged at the center of the mold in the width direction, a molten steel flow reduction wall is vertically formed at the center of the mold in the width direction by the electromagnetic brake, and the mold is immersed in each half of the mold partitioned by the molten steel flow reduction wall. A method for controlling a discharge flow of a continuous casting machine, characterized in that continuous casting is performed by using each nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5202667A JP2921352B2 (en) | 1993-07-22 | 1993-07-22 | Discharge flow control method for continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5202667A JP2921352B2 (en) | 1993-07-22 | 1993-07-22 | Discharge flow control method for continuous casting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0732099A true JPH0732099A (en) | 1995-02-03 |
| JP2921352B2 JP2921352B2 (en) | 1999-07-19 |
Family
ID=16461158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5202667A Expired - Lifetime JP2921352B2 (en) | 1993-07-22 | 1993-07-22 | Discharge flow control method for continuous casting machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2921352B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6460606B2 (en) * | 1996-09-19 | 2002-10-08 | Corus Staal Bv | Continuous casting machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5152330A (en) * | 1974-11-01 | 1976-05-08 | Kawasaki Steel Co | Yojukinzokuno chunyuhoho |
| JPS63309354A (en) * | 1987-06-12 | 1988-12-16 | Nippon Steel Corp | Continuous casting method for clad steel cast slab |
-
1993
- 1993-07-22 JP JP5202667A patent/JP2921352B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5152330A (en) * | 1974-11-01 | 1976-05-08 | Kawasaki Steel Co | Yojukinzokuno chunyuhoho |
| JPS63309354A (en) * | 1987-06-12 | 1988-12-16 | Nippon Steel Corp | Continuous casting method for clad steel cast slab |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6460606B2 (en) * | 1996-09-19 | 2002-10-08 | Corus Staal Bv | Continuous casting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2921352B2 (en) | 1999-07-19 |
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